Title of Invention	" A PROCESS FOR THE PREPARATION OF GLAZED GLASS TILES"
Abstract	This invention relates to a process for the preparation of glass tiles having glazed coating on the upper surface thereof According to the process a tile is formed from a composition having bentonite as a binder. Atleast a single glaze coating is applied on the upper surface of the tile and then the said tile is subjected to the step of tiring at a temperature of 780 to 900°C. Further this invention relates to a composition for use in the manufacture of glazed glass tiles. The composition has 60-70% by weight of glass 8 to 30% by weight of quartz and 5 to 12% by weight of bentonite in the form of a blended mix.

Title of Invention

" A PROCESS FOR THE PREPARATION OF GLAZED GLASS TILES"

Abstract

This invention relates to a process for the preparation of glass tiles having glazed coating on the upper surface thereof According to the process a tile is formed from a composition having bentonite as a binder. Atleast a single glaze coating is applied on the upper surface of the tile and then the said tile is subjected to the step of tiring at a temperature of 780 to 900°C. Further this invention relates to a composition for use in the manufacture of glazed glass tiles. The composition has 60-70% by weight of glass 8 to 30% by weight of quartz and 5 to 12% by weight of bentonite in the form of a blended mix.

Full Text	This invention relates to a process for preparation of glazed glass tiles. A process for the preparation of glass tiles is as such known in the art. The process comprises in preparing a composition of crushed glass, quartz, polyvinyl alcohol and colour wherein polyvinyl alcohol is used as a binder. The composition of the mixture so obtained is put in a mould which is subjected to the step of sintering and such that the mix has a low viscosity and the rounded edges of the dies are formed. There are certain disadvantages associated with the known composition and process for the preparation of glass tiles. One of the main disadvantages is that the liquid coating for providing glazing is not possible before firing the glass tiles, as the strength of the base material/composition in the unfired state tends to lose shape because of the liquid coating. Another disadvantage is that the composition used for the preparation of the tiles is in capable to absorb additional moisture of the liquid coating. Yet another disadvantages is that in case of dry coating, the coating is sinks into the tiles as the firing temperature of the coating material as well as base of the glass tiles is the same. Therefore even glazing on the tiles is not obtained conveniently. Therefore the main object of this invention is to propose an improved process for the preparation of glass tiles wherein the liquid coating for glazing purpose is conveniently applied in one or multiple layers. Another object of this invention is to propose a process for the preparation of a glass tiles which have sharp but smooth edges. Yet another object of this invention is to propose a process for the preparation of glass tiles which have improved weathering properties for example glazed coating is applied without damaging the tiles. Still another object of this invention is to propose a process for the preparation of glass tiles which has a better life. Yet another object of this invention is to propose a novel composition for use in the manufacture of glass tiles. According to this invention there is provided a process for the preparation of glazed glass tiles comprising the steps of blend mixing of 60-70% by weight of glass, 8 to 30% by weight of quartz, 5 to 12% by weight of bentonite and moisture, preparing glass tiles of required shapes followed by coating on the moulded glass tiles and firing the tiles, applying glazed coating on the upper surface of the moulded glass tiles, subjecting the glass tiles to the steps of firing in a furnace at the temperature of 780 to 900°C. Further according to this invention there is provided a composition for use in the manufacture of glazed glass tiles comprising 60-70% by weight of glass, 8 to 30% by weight of quartz and 5 to 12% by weight of bentonite in the form of a blended mix. The process and the composition for the preparation of qla?.ed glass tiles are herein described in detai i s . In accordance with the process of this invention the composition consisting of 60 to 75% by weight of glas%, 8 to 3O7. toy weight of quartz and 5 to 127., by weight of bentonite is prepared in the? form of a blended mix viith 4 to 87. moisture. The mixture 90 obtai .ned is, filled into the moulds so to prepare the glass tiles. The glazed coating (one or more) are then applied on the upper surface of the moulded glass tiles and then the tiles are subjected to the step of firing in a furnace at the temperature of 78O t.o 9OO°C. The firing at. the temperature of leas than 780° C will not provide the lusture and smoothness to the tiles. However,, the firing temperature depends on the composition of the base and the glaze coatings of t.he glass tiles. The glaxe coating comprises one or more coating of glaze material in the form of liquid and/or dry sprink1in g ., The tiles are preferably formed in white colour and then coloured glaze? coating are applied on the upper surface of the tiles. In distings ion to the known art the binder used in this process is taentonite and preferably vihite bentonite so as to form the glass tiles of almost, white colour. The presence of bentonite as binder increases the viscosity of the compsoition and thus the tiles having sharp tout smooth edges are formed easily. Then the colour glaze coatings are applied before subjecting the tiles to the step of firing. The glaze coating composition comprises alumina CaO and MgO, silica and Na2O. By way of example . and without implying any limitation thereto, the composition comprises alumina present in an amount more than 4%, CaO and MgO less than 5X, silica more than 65% and Na2O less than 2O7.. Mo lead has been used and also borex may or may not be used. According to an option and to get a multiple colour layer on the top of the tiles, dry sprinkling coating of different colours are provided on the liquid glaze coating provided on the top surface of the tiles. The quantum of dry sprinkling coatings is veried for each layer and need not be similar to each other. We Claim: 1. A process for the preparation of glazed glass tiles comprising the steps of:- a) blend mixing of 60-70% by weight of glass, 8 to 30% by weight of quartz, 5 to 12% by weight of bentonite and moisture, b) preparing glass tiles of required shapes followed by coating on the moulded glass tiles and firing the tiles, c) applying glazed coating on the upper surface of the moulded glass tiles, d) subjecting the glass tiles to the steps of firing in a furnace at the temperature of 780 to 900°C. 2. The process as claimed in claim 1, wherein one or more dry sprinkling coatings are provided on the glaze coatings provided on the tiles to have a multicolored layer on the top of the tiles. 3. A process as claimed in claim 1 wherein said moisture is 4 to 8%. 4. A process for the preparation of glazed glass tiles substantially as herein described and illustrated.

Full Text

This invention relates to a process for preparation of glazed glass tiles.
A process for the preparation of glass tiles is as such known in the art. The process comprises in preparing a composition of crushed glass, quartz, polyvinyl alcohol and colour wherein polyvinyl alcohol is used as a binder. The composition of the mixture so obtained is put in a mould which is subjected to the step of sintering and such that the mix has a low viscosity and the rounded edges of the dies are formed.
There are certain disadvantages associated with the known composition and process for the preparation of glass tiles.
One of the main disadvantages is that the liquid coating for providing glazing is not possible before firing the glass tiles, as the strength of the base material/composition in the unfired state tends to lose shape because of the liquid coating.

Another disadvantage is that the composition used for the preparation of the tiles is in capable to absorb additional moisture of the liquid coating.
Yet another disadvantages is that in case of dry coating, the coating is sinks into the tiles as the firing temperature of the coating material as well as base of the glass tiles is the same. Therefore even glazing on the tiles is not obtained conveniently.
Therefore the main object of this invention is to propose an improved process for the preparation of glass tiles wherein the liquid coating for glazing purpose is conveniently applied in one or multiple
layers.
Another object of this invention is to propose a process for the preparation of a glass tiles which have sharp but smooth edges.
Yet another object of this invention is to propose a process for the preparation of glass tiles which have improved weathering properties for example glazed coating is applied without damaging the tiles.

Still another object of this invention is to propose a process for the preparation of glass tiles which has a better life.
Yet another object of this invention is to propose a novel composition for use in the manufacture of glass tiles.
According to this invention there is provided a process for the preparation of glazed glass tiles comprising the steps of blend mixing of 60-70% by weight of glass, 8 to 30% by weight of quartz, 5 to 12% by weight of bentonite and moisture, preparing glass tiles of required shapes followed by coating on the moulded glass tiles and firing the tiles, applying glazed coating on the upper surface of the moulded glass tiles, subjecting the glass tiles to the steps of firing in a furnace at the temperature of 780 to 900°C.
Further according to this invention there is provided a composition for use in the manufacture of glazed glass tiles comprising 60-70% by weight of glass, 8 to 30% by weight of quartz and 5 to 12% by weight of bentonite in the form of a blended mix.
The process and the composition for the preparation of qla?.ed glass tiles are herein described in detai i s .
In accordance with the process of this
invention the composition consisting of 60 to 75% by
weight of glas%, 8 to 3O7. toy weight of quartz and 5 to
127., by weight of bentonite is prepared in the? form of a
blended mix viith 4 to 87. moisture. The mixture 90
obtai .ned is, filled into the moulds so to prepare the glass tiles. The glazed coating (one or more) are then applied on the upper surface of the moulded glass tiles and then the tiles are subjected to the step of firing in a furnace at the temperature of 78O t.o 9OO°C. The firing at. the temperature of leas than 780° C will not provide the lusture and smoothness to the tiles. However,, the firing temperature depends on the composition of the base and the glaze coatings of t.he glass tiles. The glaxe coating comprises one or more coating of glaze material in the form of liquid and/or dry sprink1in g .,

The tiles are preferably formed in white colour and then coloured glaze? coating are applied on the upper surface of the tiles. In distings ion to the known art the binder used in this process is taentonite and preferably vihite bentonite so as to form the glass tiles of almost, white colour. The presence of bentonite as binder increases the viscosity of the compsoition and thus the tiles having sharp tout smooth edges are formed easily. Then the colour glaze coatings are applied before subjecting the tiles to the step of firing.
The glaze coating composition comprises alumina CaO and MgO, silica and Na2O. By way of example . and without implying any limitation thereto, the composition comprises alumina present in an amount more than 4%, CaO and MgO less than 5X, silica more than 65% and Na2O less than 2O7.. Mo lead has been used and also borex may or may not be used.
According to an option and to get a multiple colour layer on the top of the tiles, dry sprinkling coating of different colours are provided on the liquid glaze coating provided on the top surface of the tiles. The quantum of dry sprinkling coatings is veried for each layer and need not be similar to each other.

We Claim:
1. A process for the preparation of glazed glass tiles comprising the
steps of:-
a) blend mixing of 60-70% by weight of glass, 8 to 30% by
weight of quartz, 5 to 12% by weight of bentonite and
moisture,
b) preparing glass tiles of required shapes followed by coating
on the moulded glass tiles and firing the tiles,
c) applying glazed coating on the upper surface of the moulded
glass tiles,
d) subjecting the glass tiles to the steps of firing in a furnace at
the temperature of 780 to 900°C.

2. The process as claimed in claim 1, wherein one or more dry
sprinkling coatings are provided on the glaze coatings provided on
the tiles to have a multicolored layer on the top of the tiles.
3. A process as claimed in claim 1 wherein said moisture is 4 to 8%.

4. A process for the preparation of glazed glass tiles substantially as herein described and illustrated.

Documents:

135-del1998-abstract.pdf

135-del1998-claims.pdf

135-del1998-correspondence-others.pdf

135-del1998-correspondence-po.pdf

135-del1998-description (complete).pdf

135-del1998-form-1.pdf

135-del1998-form-19.pdf

135-del1998-form-2.pdf

135-del1998-form-3.pdf

135-del1998-form-5.pdf

135-del1998-form-6.pdf

135-del1998-gpa.pdf

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Patent Number

237376

Indian Patent Application Number

135/DEL/1998

PG Journal Number

52/2009

Publication Date

25-Dec-2009

Grant Date

17-Dec-2009

Date of Filing

19-Jan-1998

Name of Patentee

UDAY GUPTA

Applicant Address

4634,AJMERE GARE,DELHI-110 006,INDIA.

Inventors:

#	Inventor's Name	Inventor's Address
1	UDAY GUPTA	4634,AJMERE GARE,DELHI-110 006,INDIA.

PCT International Classification Number

B32B 017/06

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA